Electron beam deflection system

Claim 2

An electron tube comprising: a vacuum envelope having a longitudinal axis; a cathode in said envelope for emitting an electron beam; anode means in said envelope spaced from said cathode and having a beam-limiting aperture therein through which said electron beam passes; target means in said envelope spaced from said anode means; means along said envelope between said target means and said anode means for generating an electric field, said electric field being substantially perpendicular to said longitudinal axis and having an orientation displaced substantially uniformly with distance along said longitudinal axis for producing an electric force on said electron beam, said electric field at any given instant having a substantially uniform strength therealong; and means along said envelope including said electric field for producing a magnetic field, the beginning of said magnetic field being spaced from a plane containing said beam-limiting aperture a specified distance, said magnetic field being of substantially uniform specified strength along said horizontal axis for creating a magnetic force acting in conjunction with said electric force thereby producing a resultant helical motion of said electron beam causing the electrons of said electron beam to impinge on said target means at a substantially normal direction thereto.

Claim 3

An electron tube according to claim 1 wherein said means for producing said magnetic field comprises a solenoid surrounding said means for generating said electric field.

Claim 4

An electron tube according to claim 1 wherein said means for generating said electric field comprise an electrostatic yoke coincident with said means for producing said magnetic field.

Claim 5

An electron tube according to claim 3 wherein said electrostatic yoke is twisted at a predetermined angle fron one end to the other.

Claim 6

An electron tube according to claim 3 wherein deflector shield means is disposed adjacent an entrance to said coincident means for generating said electric field and for producing said magnetic field.

Claim 7

An electron tube according to claim 1 wherein the area between said anode means and said deflector shield means defines a drift space.

Claim 8

An electron tube according to claim 3 wherein electrostatic yoke is cylindrical.

Claim 9

An electron tube according to claim 5 wherein the area between said anode means and said deflector shield means includes prefocus lens means, said lens means being energized to focus a virtual image of said beam-limiting aperture at a specified distance from an entrance to said electric and magnetic fields.

Claim 10

An electron tube comprising: a vacuum envelope having a longitudinal axis; a cathode in said envelope for emitting an electron beam; anode means in said envelope spaced from said cathode and having a beam-limiting aperture therein through which said electron beam passes; deflector shield means spaced from said anode means and having an opening therein through which said electron beam passes; target means in said envelope spaced from said deflector shield means; means along said envelope between said target means and said deflector shield means for generating an electric field, said electric field being substantially perpendicular to said longitudinal axis and having an orientation displaced substantially uniformly with distance along said longitudinal axis for producing an electric-force on said electron beam, said electric field at any given instant having a substantially uniform strength therealong; and means along said envelope including said electric field for producing a magnetic field, the beginning of said magnetic field being spaced from a plane containing said beam-limiting aperture a specified distance, said magnetic field being of substantially uniform specified strength along said horizontal axis for creating a magnetic force acting in conjunction with said electric force thereby producing a resultant helical motion of said electron beam causing the electrons of said electron beam to impinge on said target means at a substantially normal direction thereto.

Claim 11

An electron tube comprising: a vacuum envelope having a longitudinal axis; a cathode in said envelope for emitting an electron beam; anode means in said envelope spaced from said cathode and having a beam-limiting aperture therein through which said electron beam passes; deflector shield means spaced from said anode means and having an opening therein through which said electron beam passes; target means in said envelope spaced from said deflector shield means; means along said envelope between said target means and said deflector shield means for generating an electric field, said electric field being substantially perpendicular to said longitudinal axis and having an orientation displaced substantially uniformly with distance along said longitudinal axis for producing an electric-force on said electron beam, said electric field at any given instant having a substantially uniform strength therealong; and means along said envelope including said electric field for producing a magnetic field, the beginning of said magnetic field being spaced from a plane containing said beam-limiting aperture a specified distance, said magnetic field being of substantially uniform specified strength along said horizontal axis for creating a magnetic force acting in conjunction with said electric force thereby producing a resultant helical motion of said electron beam causing the electrons of said electron beam to impinge on said target means at a substantially normal direction thereto.

Claim 12

An electron optical system for focusing and deflecting an electron beam comprising: vacuum envelope means; magnetic means for generating a substantially uniform magnetic field of specified magnitude within and along an axis of said envelope means; electric field means for generating a variable electric field of substantially uniform magnitude within said envelope means thereby causing deflection of the electron beam along two coordinates of said system, said electric field being generated substantially orthogonal to said magnetic field; electron beam generating means disposed in said envelope means; means including beam-limiting aperture means disposed in said envelope means adjacent said electron beam generating means and disposed at a specified distance from an entrance to said electric and magnetic fields; target means disposed in said envelope means adjacent an exit to said electric and magnetic fields; and said electric field means causing said magnetic and electric fields to cross within said envelope means thereby forming a focus projection and scanning cavity for simultaneously projecting a focused beam of electrons onto said target means at a substantially normal direction thereto and scanning said focused beam of electrons across said target means.

Claim 13

An electron optical system for focusing and deflecting an electron beam comprising: vacuum envelope means; magnetic means for generating a substantially uniform magnetic field of specified magnitude within and along an axis of said envelope means; electric field means for generating a variable electric field of substantially uniform magnitude within said envelope means thereby causing deflection of the electron beam along two coordinates of said system, said electric field being generated substantially orthogonal to said magnetic field; electron beam generating means disposed in said envelope means; means including beam-limiting aperture means disposed in said envelope means adjacent said electron beam generating means and disposed at a specified distance from an entrance to said electric and magnetic fields; target means disposed in said envelope means adjacent an exit to said electric and magnetic fields; and said electric field means causing said magnetic and electric fields to cross within said envelope means thereby forming a focus projection and scanning cavity for simultaneously projecting a focused beam of electrons onto said target means at a substantially normal direction thereto and scanning said focused beam of electrons across said target means.

Claim 14

An electron optical system according to claim 10 wherein said electric field means is twisted a specified amount from one end to the other.

Claim 15

An electron optical system according to claim 11 wherein said electric field is twisted from 0* to 360*.

Claim 16

An electron optical system according to claim 10 wherein said target means includes mesh means at an exit of said electric and magnetic fields.

Claim 17

An electron optical system according to claim 10 wherein deflector shield means having an opening therethrough is disposed at said entrance.

Claim 18

An electron optical system according to claim 10 wherein prefocus lens is disposed between said electron beam generating means and said entrance, said lens means being energized to form a virtual image of said beam-limiting aperture at a specified distance from said entrance of said cavity.

Claim 19

An electron optical system according to claim 10 wherein said magnetic means comprises solenoid means surrounding said cavity.

Claim 20

An electron optical system according to claim 10 wherein said electric field means comprises electrostatic yoke means surrounding said cavity.

Claim 21

An electron optical system according to claim 17 wherein said electrostatic yoke means is cylindrical.

Claim 22

An electroN optical system according to claim 10 wherein the area between said beam-limiting aperture means and said entrance defines a drift space.